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the time between unplanned shutdowns of a power plant has an exponential distribution with a mean of 20 days. Find the probability that the time between two unplanned shutdow is a) less than 14 days B) more than 21 days c) less than 7 days

  • stat -

    please answer the questions I posted my homework is due by thursday 1/13/11

  • stat -

    dont know

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